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Question
What is primary productivity?
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Solution
A plant’s primary productivity is the amount of biomass or organic matter produced per unit area over a given time period during photosynthesis. It is expressed in terms of weight (g/m2/yr) or energy (kcal/m2/yr). It is classified into two types: gross primary productivity and net primary productivity. The rate at which organic matter is produced during photosynthesis is known as an ecosystem’s gross primary productivity. Net primary productivity (NPP) is calculated by subtracting respiration losses (R) from gross primary productivity.
RELATED QUESTIONS
What is primary productivity?
Write the equation that helps in deriving the net primary productivity of an ecosystem.
How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ?
Distinguish between primary and secondary productivity.
Why does primary productivity vary in different types of ecosystems?
State the relation between gross and net primary productivity.
What is the primary productivity of an ecosystem and how is it expressed?
Explain what does the equation given below show:
NPP = GPP – R
Answer the following question.
Describe the inter-relationship between productivity, gross primary productivity, and net productivity.
Write the relationship between productivity, gross primary productivity, net primary productivity, and secondary productivity.
Secondary productivity is rote of formation of new organic matter by ______.
Which one of the following ecosystem is most productive in term of net primary production?
How much of the net primary productively of a terrestrial ecosystem is eaten and digested by herbivores?
Which one of the following ecosystem has the highest annual net productivity?
In the equation GPP − R = NPP R represents ______
Productivity is the rate of production of biomass expressed in terms of ______.
Which of the following ecosystems is most productive in terms of net primary production?
Justify the pitcher plant as a producer.
Why are oceans least productive?
Primary productivity varies from ecosystem to ecosystem. Explain?
Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer. A young forest, a natural old forest, a shallow polluted lake, alpine meadow.
The primary productivity in an ecosystem is expressed as ______.
- gm-2 yr-1
- gm-2 yr
- Kcal m-2 yr-1
- Kcal m-2
Use the information provided in the table given below to answer the following questions:
| Tropic level | Net Production(KJm-2y-1) | Respiration (KJm-2y-1) |
| Top Carnivore | 50 | 35 |
| Carnivores | 420 | 378 |
| Herbivores | 4490 | 4041 |
| Producers | 45000 | 40,367 |
- Calculate the gross primary productivity.
- Analyze the trend in the Net Production from Producers to Top Carnivore. Give a reason for your observation.
Which of the following is the unit of productivity of an Ecosystem?
In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x(kcal m−2) yr−1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
Primary productivity in an ecosystem refers to the rate of generation of ______.
